October 14, 2022
GB/T6728-2002,GB/T6725-2002, GBT3094-2000, JG 178-2005, ASTM A500 JIS G3466, EN10210 or technical agreement.
GB/T3094-2000 (GB) cold press shaped rectangular tube
GB/T6728-2002 (GB) structure of cold bending hollow steel
Welded rectangular tubes and seamless rectangular tubes of carbon steel cold formed circular and profiled sections for ASTM A500 structures
EN10219-1-2006(European Standard) non-alloy and fine grain cold formed welded hollow structural profiles
Angular rectangular tubes for general construction
